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 tub to shower conversations
Author: Stl (CA)

Does the vent need to be up sized to 2" aswell everything to the main run out

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 Re: tub to shower conversations
Author: North Carolina Plumber (NC)

The vent needs to be 2" only if you are using it to wet vent another fixture, if it's only serving the shower trap then 1 1/2" is fine. The trap and drain does need to be 2".

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 Re: tub to shower conversations
Author: packy (MA)

unless the shower drain is below grade (in the cement floor). the minimum size allowed below grade is 2 inch. once above the cement floor then 1 1/2 vent is fine as my friend from NC replied..

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